Coffer-dam



(No Mader.) ,A 2 Sneeuw-Sheen 1.A

J. E; ROBINSON.

'GOPPBR' DAM. Noi 414,083. Y Patnted'Ootf. 29. 1889...

'HMH 'l (No Model.) A '.2 Sheets-Sheba.

J; E. ROBINSON.

COPPER DAM. y No. 414,083. Paten-ted Oct. 2 9,A 1889.

nue/dol? I MM-w -UNITED STATESv PATENT OFFICE.

JOHN E. ROBINSON, OF PHILADELPHIA, PENNSYLVANIA.

C O F F E R D A M srncrrrcnrron forming pm of Letters Patent No.414,083, dated caoba-29, 1889. Application filed June 10, 1889. SerialNo. 313,683. No model.)

lTo all whom .w may concern:

Be it known that I, JOHN E. ROBINSON, of the city and county ofPhiladelphia, and State of Pennsylvania, have invented certain new anduseful Improvements in Cotter-Dams, of which the following is aspecification, reference being had to the accompanying drawings, and tothe letters of reference marked thereon.

.The object and nature of my invention will be fully set fort-h in thefollowing specification and claims.

In the drawings, Figure 1 is a plan of my improved coer-dam. Figs. 2 and3 are vertical transverse sections on the lines o; and -y y,respectively, of Fig. 1. Fig. -i is a plan of a portion of a coier-damafter the masonry7 has been built. Fig. 5 shows a modification of myinvention; and Fig. 6 is a vertical transacr'versc section on the line zz, Fig. 5.

Similar letters of reference indicate similar parts in the severalfigures.

A A represent cylinders made in vertical sections, bolted together inthe usual man'e'i'.-.

B B are whaling-pieces, preferably of channel-iron, and arched as shown.The flanges b of the channel-irons B are cut away at each end, to allowthe flat portion b to rest against the cylinders. As many whaling-piecesmay be used as desired; in the drawings three are represented. Suitablebraces C extend across the cylinders opposite the whaling-pieces, toprevent the cylinders being crushed in.

D D are braces extending across from the whaling-pieces on one side tothose opposite. These braces inay be made. to abut against thechannel-irons in various ways well known in the art. In the drawings Ihave shown them notched into the channel-irons so that their ends. abutagainst the fiat portion h.

E represents' matched piling driven down so as to bear against the outersurface of the iiat portion b of the channel-irons.

F are angle-irons bolted, preferably, to the cylinders and extendingtheir entire length, for the purpose of forming abutments against whichthe end piles on each side of the cylinders may rest.

In opera-tion the whaling-pieces are suitably secured to the cylinders,the braces D and Gsecured in their respective positions, and the wholesunk in the desired location.

- The piling is then driven in its place, after which the water and mudare removed from the interior of the @offer-dam. As the masonryprogresses the long braces D are removed and short braces'D, which abutagainst the masonry and the whaling-pieces, as shown in Fig. 4,substituted. The sections of the cylinders within thevcoifer-dam canalso be removed and the masonry extended into t-he cylinders. By thisarrangement the coier-dam can be shortened to a considerable extent,and, as a consequence, the expense of constructing it decreased.

Referring to Figs. 5 and G, I have here shown my invention applied to adam which may extend across a wide space for the purpose of holding backwater, dto., when it is desired to perform any work pertaining tohydraulic engineering at some distance from the inner side of the dam.In this case the whaling-pieces on the inner side of the dam have theirfiat portion D against the cylinders, and the flanges b do not come incontact with them. On the outer side of the dam the flanges l) are cutaway, as in Fig. l, to allow the flat portion Z1 to come against thecylinders. The whalingpieces are arched and. are attached to thecylinders so that those on one side will be concentric with those on theopposite side as far as the cylinders extend. The whalingpieces extendbeyond the end cylinders and are bent in opposite directions, so as tobring them to a point G, where they are bolted together, thus renderingthe whole structure compact and preventing its being twisted out ofposition. The piling E is driven on the outer periphery of thewhaling-pieces on both sides of the cylinders, and, as it is notintended to excavate inside the cylinders or between the piling, thebraces C and D may be omitted.

Angle-irons l? may be bolted to the ends of the whaling-pieces 011 t-heouter face of the dam, if necessary, to form an abutment for the endpiles.

Having described my invention, I claiml. In a Cotter-dam, the'combination, with a series of cylinders at a distance from each other,of arched whaling-pieces bolted to said cylinders on opposite sides andpiling driven against the face of the whaling-pieces, sub` stantially asdescribed.

2. In a Cotter-dam, the combination, with a IOO ' series of cylinders ata distance from each 3. In a coferdam,'the combination, with a series ofcylinders at a distance from each other, said cylinders being made ofvertical sections bolted together, of arched whalingpieces secured tosaid cylinders on opposite sides thereof, braces extending across thecylinders opposite the whaling-pieces, and piling driven against theface of the whaling-pieces,

substantially as specified,

4. In a coier-dam, the combination, with a Aseries l01:' cylinders at adistance from each other, of arched Lxaling-pieces bolted to saidcylinders `on opposite sides thereof, kpiling zo driven against the faceof the Whaling-pieces, land angle-irons to form an abutment for the endpiles, substantially as specified. l n

In testimony whereof I 'liave'hereunto set my hand and seal.

JOHN E. ROBINSON. [n S.]

VVitnesses':' v I E. cR'U'sE; en. HOWAR; Y j

